Effect of chemical pressure induced by 
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 substitution on the magnetic ordering of 
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Verseils, Marine; Mezzadri, Francesco; Delmonte, Davide; Klein, Yannick; Shcheka, Svyatoslav; Chapon, L. C.; Hansen, T.; Gilioli, E.; Gauzzi, A.

doi:10.1103/physrevmaterials.1.064407

Cited by 10 publications

(19 citation statements)

References 25 publications

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“…Indeed, similar structural behavior to that described above has been observed in YMn 7 O 12 , which undergoes a purely structural phase transition at 200 K, independent of lower-temperature ferrimagnetic order [21]. This transition also involved a large monoclinic strain, negative thermal PHYSICAL REVIEW LETTERS 125, 097601 (2020) expansion, and off-centering displacements of yttrium, which, together with an ordered pattern of oxygen displacements, improved the bonding conditions of underbonded yttrium [21,28,29]. A NPD study [21] found no evidence for the ordering of yttrium polar displacements, whereas a later single crystal x-ray diffraction study [29] reported partial antiferroelectric order.…”

Section: (B)-4(d)] Negative Thermal Expansion [supporting

confidence: 69%

Emergence of a Magnetostructural Dipolar Glass in the Quadruple Perovskite Dy1−δMn7+δO12<

et al. 2020

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We show that a polar, pseudo-Jahn-Teller instability exists for the underbonded rare-earth A-site cations in the quadruple perovskite Dy 1−δ Mn 7þδ O 12 , which leads to the spontaneous formation of a dipolar glass. This observation alone expands the applicability of pseudo-Jahn-Teller physics in perovskite-derived materials, for which it is typically confined to B-site cations. We demonstrate that the dipolar glass order parameter is coupled to a ferrimagnetic order parameter via strain, leading to a first order magnetostructural phase transition that can be tuned by magnetic field. This phenomenology may emerge in a broad range of perovskite-derived materials in which A-site cation ordering and octahedral tilting are mutually tied to meet the criteria of structural stability.

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Section: (B)-4(d)] Negative Thermal Expansion [supporting

confidence: 69%

Emergence of a Magnetostructural Dipolar Glass in the Quadruple Perovskite Dy1−δMn7+δO12<

et al. 2020

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“…These materials are characterized by A site cation ordering, where 3 4 of the original perovskite A sites are occupied by Mn 3+ ions in an uncommon square planar coordination (Figure 1), only stabilized by high-pressure/high-temperature (HP/HT) synthesis. The valence of the A ion tunes the Mn 3+ /Mn 4+ ratio on the B site, determining the crystal symmetry based on the specific charge and orbital ordering, as reported for compounds with A = Na [23], Ca [24], (Sr, Cd) [25], Pb [26], La [27,28], Bi [29,30], Y [31], and Pr [32]. The high electronic correlations, the significant lattice distortions, the full oxygen occupation (contrary to what usually happens in the conventional "simple" perovskites) and the chemical order (hetero-valent manganese atoms occupy different crystallographic sites), make this class of materials an intriguing playground for the study of possible instabilities induced by external stimuli on both the structural and physical properties.…”

Section: Introductionmentioning

confidence: 89%

High Pressure Induced Insulator-to-Semimetal Transition through Intersite Charge Transfer in NaMn7O12

et al. 2018

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Abstract:The pressure-dependent behaviour of NaMn 7 O 12 (up to 40 GPa) is studied and discussed by means of single-crystal X-ray diffraction and resistance measurements carried out on powdered samples. A transition from thermally activated transport mechanism to semimetal takes place above 18 GPa, accompanied by a change in the compressibility of the system. On the other hand, the crystallographic determinations rule out a symmetry change to be at the origin of the transition, despite all the structural parameters pointing to a symmetrizing effect of pressure. Bond valence sum calculations indicate a charge transfer from the octahedrally coordinated manganese ions to the square planar ones, likely favouring the delocalization of the carriers.

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“…15 LaMn7O12 also shows an orbital order (OO) transition from Im-3 to I2/m at 650 K, 10,11 and it keeps the I2/m symmetry down to the low temperatures. 9 YMn7O12 belonging to the fourth group exhibits one second-order magnetic spin order transition at a higher temperature of TN = 108 K without any dielectric anomalies, and it shows an isostructural transition (from I2/m to I2/m) at 200 K, 13 whose nature is still not known. DyMn7O12 shows a strongly first-order transition at TN1 = 108 K accompanied by a sharp drop on temperature dependence of dielectric constant, and it shows Dy ordering at TN2 = 8 K. Note that we found that such compounds with small rare-earth elements (R = Tb-Er and Y) have actually (R1-…”

Section: Introductionmentioning

confidence: 99%

“…6 Second, the HP, HT synthesis can produce the so-called A-site-ordered AA′3B4O12 quadruple perovskites with a 1:7 ratio and the RMn7O12 stoichiometry. [7][8][9][10][11][12][13] RMn7O12 manganites with R = La, [7][8][9][10][11] Pr, 12 Nd, 7 and Y 13 have been reported so far. Third, the HP, HT synthesis can result in the partial charge disproportionation of Mn 3+ and the appearance of Mn 2+ and Mn 4+ in HP products.…”

Section: Introductionmentioning

confidence: 99%

High-Pressure Synthesis, Structures, and Properties of Trivalent A-Site-Ordered Quadruple Perovskites RMn₇O₁₂ (R = Sm, Eu, Gd, and Tb)

et al. 2018

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A-site-ordered quadruple perovskites RMnO with R = Sm, Eu, Gd, and Tb were synthesized at high pressure and high temperature (6 GPa and ∼1570 K), and their structural, magnetic, and dielectric properties are reported. They crystallize in space group I2/ m at room temperature. All four compounds exhibit a high-temperature phase transition to the cubic Im3̅ structure at ∼664 K (Sm), 663 K (Eu), 657 K (Gd), and 630 K (Tb). They all show one magnetic transition at T ≈ 82-87 K at zero magnetic field, but additional magnetic transitions below T ≈ 12 K were observed in SmMnO and EuMnO at high magnetic fields. Very weak kinklike dielectric anomalies were observed at T in all compounds. We also observed pyroelectric current peaks near 14 K and frequency-dependent sharp steps in dielectric constant (near 18-35 K)-these anomalies are probably caused by dielectric relaxation, and they are not related to any ferroelectric transitions. TbMnO shows signs of nonstoichiometry expressed as (TbMn )MnO, and these samples exhibit negative magnetization or magnetization reversal effects of an extrinsic origin on zero-field-cooled curves in intermediate temperature ranges. The crystal structures of SmMnO and EuMnO were refined from neutron powder diffraction data at 100 K, and the crystal structures of GdMnO and (TbMn)MnO were studied by synchrotron X-ray powder diffraction at 295 K.

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Effect of chemical pressure induced by La3+/Y3+ substitution on the magnetic ordering of (

Cited by 10 publications

References 25 publications

Emergence of a Magnetostructural Dipolar Glass in the Quadruple Perovskite Dy1−δMn7+δO12<

Emergence of a Magnetostructural Dipolar Glass in the Quadruple Perovskite Dy1−δMn7+δO12<

High Pressure Induced Insulator-to-Semimetal Transition through Intersite Charge Transfer in NaMn7O12

High-Pressure Synthesis, Structures, and Properties of Trivalent A-Site-Ordered Quadruple Perovskites RMn₇O₁₂ (R = Sm, Eu, Gd, and Tb)

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Effect of chemical pressure induced by La3+/Y3+ substitution on the magnetic ordering of (

Cited by 10 publications

References 25 publications

Emergence of a Magnetostructural Dipolar Glass in the Quadruple Perovskite Dy1−δMn7+δO12<

Emergence of a Magnetostructural Dipolar Glass in the Quadruple Perovskite Dy1−δMn7+δO12<

High Pressure Induced Insulator-to-Semimetal Transition through Intersite Charge Transfer in NaMn7O12

High-Pressure Synthesis, Structures, and Properties of Trivalent A-Site-Ordered Quadruple Perovskites RMn7O12 (R = Sm, Eu, Gd, and Tb)

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Product

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High-Pressure Synthesis, Structures, and Properties of Trivalent A-Site-Ordered Quadruple Perovskites RMn₇O₁₂ (R = Sm, Eu, Gd, and Tb)